Shells quite similar to those of H. tuberculata Linnaeus, 1758 f. lamellosa Lamarck, 1822.The corded sculpture is less pronounced, and finer. The lamellae are weaker or absent.Above and below: 2-8m deep, in crevices, in reefs around Elafonisi, SW. Crete. 25-25mm.

The main characteristic of this species remains "the highly complex, profuse, multi-branching papillaethat often fill the epipodium from margin to margin." (Buzz Owen).

Live (row2) and dead (row1) collected, at 1-2m deep, under stones and pieces of metal,in wrecks on shallow reef, route du Port, near the railway, in the harbour, Isola Rossa, Corsica. 28-31mm.

Punta di Spanu, Calvi bay, Corsica, On the southern side, offshore at various depths.One alive under rock at 5m, one in an Octopus nest. 27-31mm.

The shore on NW. end of Korissia lagoon, south Corfu, in Spring.The winter storms pushed ashore dead leaves of Posidonia, and built there two hairy sentinels.
A rocky bottom covered with various stones, and a large field of Posidonia a hundred meters offshore,in a few feet deep: all conditions that are much sought after by mykonosensis.